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Finding the Fourth Proportional to 5,707.92, 7,879.20 and 3,720.18

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Solution

The fourth proportional to 5,707.92, 7,879.20 and 3,720.18 is: 5,135.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,707.92 : 7,879.20 = 3,720.18 : x
  2. Step 2: Convert to fraction form
    5,707.92/7,879.20 = 3,720.18/x
  3. Step 3: Cross multiply
    5,707.92x = 7,879.20 × 3,720.18
  4. Step 4: Simplify right side
    5,707.92x = 29,312,042.26
  5. Step 5: Solve for x
    x = 29,312,042.26/5,707.92
  6. Step 6: Final answer
    x = 5,135.33

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.